Mixing machine



vMaly 24, 1938.v F. A. scHLETz MIXING MACHINE Original Filed Feb. 2, 1.935

Fred A. Schletz l Bq fr Jtorneqs Patented May 24, 1.938

i UNITED sTArEf-s yMiracle Paint Rejuvenator n'Gornpa'ny, :Incorporated, St. Paul, Minn., -a corporation :fof

Minnesota original application February"2,"1933,fsria1 No.

654,874. Divided and this'application Novemrter 8, V1935, .serial No. 48,862

7 Claims.

My invention relates to mixing machines for mixingV in cans, pails,I drums or barrelsV or other closed receptacles the contents thereof, and has `for an object to provide a simple, durable and 'efficient machine vfor the purpose.

VAnother object of the invention resides in providing a rock shaft-or other oscillatory member having one or morereceptacle holders attached thereto and in further providing mechanism for imparting to the rock shaft a peculiar movement particularly eifective in producing rapid and thorough mixing-of the contents ofthe receptacle.

An object of the invention resides in constructving the mechanism with a crank adapted to impart to the rock shaft an irregular oscillatory motion attended with a quick throw in vone vdirection and a relatively slow return.

Another object of the-invention resides in -providing a member pivoted to the crank and a connecting rod acting between said pivoted member vand the oscillatory lmember and in further providing a sliding connection between said connecting rod and one of .said members, the connecting rod being fixed relative to the other member.

Astill further object of the invention resides in providing the oscillatory member and pivoted member with aligning bores, the connecting` rod lbeing slidable inY one bore and `fixed within' the other bore.

A feature of the invention resides in using an .eccentric las the crank and in forming the guide on theeccentric strap, said guide being substantially tangent to the eccentric.

Other -objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustratedV and/ or described.

-In the drawing:

Fig. 1 is a side elevational view of a mixing machine illustrating an embodiment of Ymy invention.

'-Fig. 2 is a transverse sectional view of the machine vwith the `end plate removed and taken-on line 2-2 of Fig. l.

This application for patent is a division of my copending application for patent for mixing machine ledA February 2, 1933, under Serial Number 654,874, and renewed June 28, 1935, now Patent No. 2,022,526, dated'Nov. 26, 1935.

The illustrated form of vmy invention comprises two receptacle holders IIJ and II mounted on a rock shaft 28 adapted to be violently rocked through a transmission'mechanism indicated at its entirety by the numeral I2. The .mechanism `-l2in`c'l;udes certaingmechanical movements for yimparting -a peculiar oscillatory movement to therock shaft 28 whereby rapid and thorough mixing of the `contents'of the receptacles is procured. The mechanism I2 is contained within a case I3 which is secured to a base I4 and said mechanism is operated by a motor33 also secured to said base. Base I4 is adapted to be vbolted to a gtable, counter or other horizontal surface on which the machine is to be mounted by means of bolts or lag screws 53 which pass through said base.

Inasrnuch as the form or construction of the holders l0 -and II does not constitute a feature -of the present invention,`these'holders `will not be described in vdetaiLbut may be constructed as shown and described in my copending application for patent, Serial Number"65,4,874 above referred to, or any other type of holder suitable -for'the purpose may be used in place thereof.

vThe'case I3 includes sides I1 and I8, an end I8 and a vbottom 2|, being open yat the top and one end. The open top of the case is closed by a -cover iand the open end lis closed by an end 'pla-te I5. These parts'may be bolted in place` by -means of bolts or cap screws'which extend through said cover `and end plate and which are threaded into the case proper. In continuation of the bottom 2l of the caseare formed two flanges 22 and 23 which project outwardly from lt-he ends of the case and which rest upon the base lli. The case I3 is secured to base I4 bymeans `of cap screwsfZd'which pass through said flanges and are screwed into the base.

n the-exterior of the end plate IB is formed Y a bearing 25. A similar'bearing 26 detachable from the case is bolted to the end wall I9 thereof 'by means of bolts 21 as best shown in Fig. 1. These two bearings are in Valignment and journal the rock shaft 28 previously `referred to, which carries the two receptacle holders l0. and II.

The transmission mechanism I2 includes an eccentric shaft 3| which is journaled in the followingmanner: Secured to the yend wall I9 of Ycase I 3 is another bearing 29 similar to bearing 26 and formednpon the .interior of the end platefl .is a bearing-3Ildisposed in alignment with' the bearing 29. These vbearings journal the eccentric. shaft 3! which :is parallel. to shaft'28.

Shaft 3! lprojects outwardly through vthe case il() and has attached to .its rprotruding end a pulley 32. The electric motor 33 is constructed with 'flanges 38 and-39 which form a base therefor and is attached' to the base I4 by means of bolts or cap screwsldllwhich pass through these flanges 65 and are screwed into said base. This motor has attached to its armature shaft 35 a pulley 3B. A belt 3i passes about both the pulleys 36 and 32 and drives the eccentric shaft 3|.

Within the interior of case |3 and upon the shaft 3| is mounted an eccentric indicated in its entirety by the reference numeral 4|. This eccentric includes an eccentric disk 42 which is keyed to the shaft 3|. An eccentric strap 43 encircles said disk. The strap 43 is formed in two parts 44 and 45 having fianges 46 and 41 adapted to be bolted together by means of bolts 48. The part 45 of eccentric strap 43 is formed with an elongated boss 4S which is bored `at 50 to provide a bearing or guide which slidably receives a cylindrical connecting rod 5|. In the rock shaft 3| is formed a transverse bore 52 which is in alignment with bore 50. The connecting rod 5| extends through both of these bores being fixed in the bore 52 and being slidable in bore 50. Bore 50 is substantially tangent to the eccentric disk 42 or strap 43 so that the said rod passes completely through the boss 49 and may reciprocate freely within the bore 50 therein.

The connecting rod 5| functions as a lever which operates to twist or oscillate the shaft 28, the force operating said lever being applied through the boss 49 and eccentric 4|. Due to the fact that the rod 5| slides in the guide formed by bore 5@ the leverage changes as the shaft 3| rotates and as the eccentric strap 43 and boss 49 move toward and from the shaft 28. When the eccentric disk 42 is disposed as illustrated in Fig. 2, the lever arm is longest and when it has rotated degrees the lever arm is shortest. This produces a rocking or oscillating movement of the shaft 28, which is relatively fast in one d"- rection and slower in the other direction, whereby a rapid throw followed by a relatively slow return motion is imparted to the holders |0 and In other words, different rates of acceleration and deceleration are procured as the shaft rocks to and fro. Such motion I have found produces excellent results in the mixing of paints and other similar substances at low speeds and is much more effective than the regular oscillatory motions in the ordinary machines operating at higher speeds.

My invention is highly advantageous in that a machine is provided in which thorough mixing is rapidly procured, and in far less time than is the case with similar machines now in common use. With my inventionthe mechanism can be operated at a lower speed, thus reducing vibration of the machine and support. The device hence requires less power and the wear and tear on the moving parts is appreciably reduced. My invention does not require the excessive weight and rigidity necessary with other machines and the cost is hence considerably less.

Changes in the specific form of my invention, as herein disclosed, may be made within the scope of what is claimed without departing from the spirit of my invention. Y

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

1. In a mixing machine, a rock shaft, a driving shaft, an eccentric disc operated by said driving shaft, an eccentric strap encircling said eccentric disc, a guide formed in said eccentric strap, a connecting rod slidable in said guide and secured to said rock shaft, and a holder attached toI said rock shaft.

2. In a mixing machine, a rock shaft, a driving shaft, an eccentric disc operated by said driving shaft, an eccentric strap encircling said eccentric disc, a guide formed in said eccentric strap, said guide being substantially tangent to said eccentric strap, a connecting rod slidable in said guide and secured to said rock shaft, said rod extending completely through said guide and-past the tangent point thereof when the driving shaft is in one of its positions, and a holder attached to said rock shaft.

3. In a mixing machine, a` support, a drive shaft journaled in said support, a rock shaft also journaled in said support, receptacle holding means carried by the rock shaft, power transmission means interposed between the drive shaft and rock shaft for imparting an irregular oscillatory motion'to said holding means through said rock shaft, said transmission means comprising an eccentric on the drive shaft, a rocker rod projecting from the rock shaft, and an eccentric strap on said eccentric, said strap having a bearing thereon slidably embracing said rocker rod.

4. An actuating device for a mixing machine for mixing substances in closed containers, said device comprising a support, a bearing in said support, a rock shaft journalled in said bearing, a second bearing in said support, a driving shaft journalled in said second named bearing, an eccentric disc carried by said driving shaft, an eccentric strap encircling said disc, a guide formed in said eccentric strap, said guide being substantially tangent to said eccentric strap, a connecting rod slidable in said guide and secured to said rock shaft, said rod extending completely through said guide and past the tangent point thereof when the driving shaft is in one of its positions, and means on said rock shaft for supporting a container holder.

5. In a machine of the character described, a rock shaft, a holder attached thereto and adapted to receive a closed receptacle containing material to be mixed, a driving shaft, an eccentric disc operated thereby, an eccentric strap encircling said disc, a rocker rod disposed substantially tangentially with respect to said strap, said rod connecting said eccentric strap and rock shaft and slidable relative to one thereof, said rock shaft being turned by said rocker rod in one direction fromV one extreme to the other in less than a one-half turn of theV driving shaft, thus imparting an irregular oscillatory motion to the receptacle in said holder, such motion being attended with a quick throw one way and a relatively slow return, whereby the contents of the oscillating receptacle is caused to circulate in said receptacle.

6. In a machine for mixing paint or'other material in closed cans, a rock shaft, a holder attached thereto and rockable therewith, said holder being adapted to receive a closed can containing material to be mixed and to hold said can more or less uprightly disposed with the axis of the rock shaft passing therethrough substantially at the center thereof, a crank, means connecting said crank with said rock shaft for rocking the latter, the relative disposition of said crank and rock shaft being such that said means causes the rock shaft to be turned in one direc- ,tion from one extreme to the other in materially less than a one-half turn of said crank, thus imparting an irregular oscillatory motion to the can in said holder, such motion being attended withV a quick throw one way and a materially slower return, whereby a definite circulatory movement of the contents of the can is set up Vtherein from end to end thereof about said axis of said rock shaft.

7. In a machine ofthe character described, a rock shaft, a holder attached thereto and rockable therewith, said holder being adapted to receive a closed receptacle containing material to be mixed and to hold said receptacle in all positions thereof With the axis of said rock shaft passing therethrough, a crank, means connecting said crank with said rock shaft for rocking the latter, the relative disposition of said crank and 10- rock shaft being such that said means causes the rock shaft to be turned in one direction from one extreme to the other in materially less than a one-half turn of said crank, thus imparting an irregular oscillatory motion to the receptacle in said holder, such motion being attended with a quick throw one way and a materially slower return, whereby the contents of the oscillating receptacle is caused to circulate in said. receptacle and about said axis of said rock shaft.

FRED A. SCHLETZ. 

